Just over the course of the summer, my sheltie has developed dry skin spots all over, and I mean ALL over the place. I noticed them when I was petting and scratching him and one of his bag legs started thumping. Then, I noticed them all over the top of him and on the underside as well. I have sprayed natural hot spot spray on them and have also used medicated shampoo. They have gotten a lot better, but has anyone else had this problem with their sheltie/know what it is?